On the topic of lethal damage, I think we also need to add some kind of indicator for what attacks are tank busters during normal content. As it stands, it's not very hard for tanks to learn what kind of attacks are tank busters since they're the ones getting hit with them, but for healers it can actually be a bit harder. Yes, you see that your tank's HP has dropped, but I can say from experience that when you're not yet at savage level content, you can easily fall into the category of reactionary healer who doesn't look at what's going to happen, but just heals what comes after. If we added indicators for normal content, it would help teach healers that a tank buster is something you can identify and react to preemptively. We can also take away these indicators during extreme, savage, and ultimate content in the same way that some AoE telegraphs are removed, so rather than forcing training wheels in all forms of content, it's just there to help less skilled healers understand how to get better.

Taking a tangent from that avenue, I think the biggest issue with making lethal damage that requires shielding a staple is that it makes shields a staple for every healer which I honestly don't think should be the case. Shielding shouldn't need to be a requirement on all healers. Healing methods outside of direct healing effectively are working to create a way that your spells can continue to keep the party alive without the need of additional GCD casts, or in other words, they let us DPS more frequently. I think shielding could go back to being a Scholar thing only, on the OGCD instead, and have it only apply the shield (with added potency to cover the lost healing), to make it a tool used to extend the amount of time you have to DPS.